When you get logged into your D-Link, the first thing you should see is your Status screen:

To configure wireless settings: click on the Home tab at the top, then click on Wireless on the left menu.
This is the screen where you configure your wireless options:

Make sure your SSID has no spaces or special characters

Make sure Auto scan is not enabled and the channel is preferrably not on 6

WEP64/128, WPA TKIP/AES are used if security is enabled (WPA2 is not compatible)

To enable DMZ, click on the Advanced tab on the top menu, and click on DMZ on the left menu, and you will get this screen:
If DMZ is necessary check enabled. You will need to finish the last octet of the IP address and click apply, then assign this IP to the SkyAngel STB for DMZ to work. For instructions on how to set up a Static IP address click here.